Which explains how wind causes upwelling in the oceans?

a.
wind near the coastline blows cold surface water away from land. deeper, nutrient-rich, warm water flows upward to replace the surface water.

b.
wind near the coastline blows warm surface water toward shore, causing it to spread out. deeper, nutrient-rich, cold water flows upward to replace the surface water blown into shore.

c.
coastal winds blow warm surface water out to sea. deeper, nutrient-rich, cold water flows upward to replace the surface water.

d.
wind near the coastline blows cold surface water toward shore, causing it to spread out. deeper, nutrient-rich, warm water flows upward to replace the surface water blown into shore.